Kourtney Kardashian’s 45-pound weight loss was fueled in part by a loss of appetite brought on by anxiety after her breakup from boyfriend Scott Disick.

While Kourtney looks fantastic, she told fans in a revealing blog post her dramatic weight loss stemmed from anxiety over raising her three children as a single mom.

“Everyone deals with hard times in their lives differently,” said Kardashian. “I’m generally not a nervous person but I get anxious. I also get nauseous and feel like I can’t eat when it is really bad, but I force myself to stay healthy.”

Kourtney, who now has a sexy bikini body, works out a lot to cope with her anxiety. “One thing I’ve found that really helps is working out,” she said. “I try to exercise 5 days a week.”

She added: “I usually start with a quick run or jumping rope to warm up. I have to do something fast to really kill [the anxiety]. And I definitely need good music.”

Kourtney is annoyed that some people think her weight loss was due entirely to vanity.

“People are very quick to judge others by appearances but you truly don’t know what someone’s motivation is or what is going on inside them,” she said. “For me, exercise is as much about my body as it is about calming my mind.”

Kardashian, who gave birth to her third child in December 2015, has lost the 45 pounds she gained during her pregnancy.

The 5-foot-2 brunette stunner is now skinnier and fitter than ever.

Kourtney has shared numerous workout photos and chronicled her weight loss on Instagram during the past year.

Kourtney’s weight loss secrets are an organic diet, waist training and intense exercise that includes yoga and cardio workouts such as running, Examiner reported.

Kardashian, 36, follows a low-carb organic diet that includes plenty of healthy fats, which she credits for her glowing skin and youthful appearance.

“Good health begins with what you put in your body,” said fitness expert Elizabeth Stein, author of Eating Purely. “When you eat better, you feel better. It’s that simple.”